Delbert Mann Director Maximilian Schell Herr Sessemann Actor Jennifer Edwards Heidi Actor Jean Simmons Frl. Rottenmeier Actor Michael Redgrave Grandfather Actor Walter Slezak Father Richter Actor Peter van Eyck Dr. Reboux Actor Zuleika Robson Klara Actor Elizabeth Neuman Grandmother Actor John Moulder-Brown Peter Actor Miriam Spoerri Aunt Dete Actor Frederick H. Brogger Producer James Franciscus Producer